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/**CFile****************************************************************
FileName [int2Bmc.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Interpolation engine.]
Synopsis [BMC used inside IMC.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - Dec 1, 2013.]
Revision [$Id: int2Bmc.c,v 1.00 2013/12/01 00:00:00 alanmi Exp $]
***********************************************************************/
#include "int2Int.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Trasnforms AIG to transition into the init state.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Int2_ManDupInit( Gia_Man_t * p, int fVerbose )
{
Gia_Man_t * pNew, * pTemp;
Gia_Obj_t * pObj, * pObjRi, * pObjRo;
int i, iCtrl;
assert( Gia_ManRegNum(p) > 0 );
pNew = Gia_ManStart( 10000 );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManConst0(p)->Value = 0;
Gia_ManForEachCi( p, pObj, i )
{
if ( i == Gia_ManPiNum(p) )
iCtrl = Gia_ManAppendCi( pNew );
pObj->Value = Gia_ManAppendCi( pNew );
}
Gia_ManHashAlloc( pNew );
Gia_ManForEachAnd( p, pObj, i )
pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
Gia_ManForEachPo( p, pObj, i )
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
Gia_ManForEachRiRo( p, pObjRi, pObjRo, i )
Gia_ManAppendCo( pNew, Gia_ManHashMux( pNew, iCtrl, pObjRo->Value, Gia_ObjFanin0Copy(pObjRi) ) );
Gia_ManHashStop( pNew );
Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
// remove dangling
pNew = Gia_ManCleanup( pTemp = pNew );
if ( fVerbose )
printf( "Before cleanup = %d nodes. After cleanup = %d nodes.\n",
Gia_ManAndNum(pTemp), Gia_ManAndNum(pNew) );
Gia_ManStop( pTemp );
return pNew;
}
/**Function*************************************************************
Synopsis [Returns 1 if AIG has transition into init state.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Int2_ManCheckInit( Gia_Man_t * p )
{
sat_solver * pSat;
Cnf_Dat_t * pCnf;
Gia_Man_t * pNew;
Gia_Obj_t * pObj;
Vec_Int_t * vLits;
int i, Lit, RetValue = 0;
assert( Gia_ManRegNum(p) > 0 );
pNew = Jf_ManDeriveCnf( p, 0 );
pCnf = (Cnf_Dat_t *)pNew->pData; pNew->pData = NULL;
pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
if ( pSat != NULL )
{
vLits = Vec_IntAlloc( Gia_ManRegNum(p) );
Gia_ManForEachRi( pNew, pObj, i )
{
Lit = pCnf->pVarNums[ Gia_ObjId(pNew, Gia_ObjFanin0(pObj)) ];
Lit = Abc_Var2Lit( Lit, Gia_ObjFaninC0(pObj) );
Vec_IntPush( vLits, Abc_LitNot(Lit) );
}
if ( sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits), 0, 0, 0, 0 ) == l_True )
RetValue = 1;
Vec_IntFree( vLits );
sat_solver_delete( pSat );
}
Cnf_DataFree( pCnf );
Gia_ManStop( pNew );
return RetValue;
}
/**Function*************************************************************
Synopsis [Creates the BMC instance in the SAT solver.]
Description [The PIs are mapped in the natural order. The flop inputs
are the last Gia_ManRegNum(p) variables of resulting SAT solver.]
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Int2_ManFrameInit( Gia_Man_t * p, int nFrames, int fVerbose )
{
Gia_Man_t * pFrames, * pTemp;
Gia_Obj_t * pObj;
int i, f;
pFrames = Gia_ManStart( 10000 );
pFrames->pName = Abc_UtilStrsav( p->pName );
pFrames->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManConst0(p)->Value = 0;
// perform structural hashing
Gia_ManHashAlloc( pFrames );
for ( f = 0; f < nFrames; f++ )
{
Gia_ManForEachPi( p, pObj, i )
pObj->Value = Gia_ManAppendCi( pFrames );
Gia_ManForEachRo( p, pObj, i )
pObj->Value = f ? Gia_ObjRoToRi(p, pObj)->Value : 0;
Gia_ManForEachAnd( p, pObj, i )
pObj->Value = Gia_ManHashAnd( pFrames, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
Gia_ManForEachRi( p, pObj, i )
pObj->Value = Gia_ObjFanin0Copy(pObj);
}
Gia_ManHashStop( pFrames );
// create flop inputs
Gia_ManForEachRi( p, pObj, i )
pObj->Value = Gia_ManAppendCo( pFrames, Gia_ObjFanin0Copy(pObj) );
// remove dangling
pFrames = Gia_ManCleanup( pTemp = pFrames );
if ( fVerbose )
printf( "Before cleanup = %d nodes. After cleanup = %d nodes.\n",
Gia_ManAndNum(pTemp), Gia_ManAndNum(pFrames) );
Gia_ManStop( pTemp );
return pFrames;
}
sat_solver * Int2_ManSetupBmcSolver( Gia_Man_t * p, int nFrames )
{
Gia_Man_t * pFrames, * pTemp;
Cnf_Dat_t * pCnf;
sat_solver * pSat;
// unfold for the given number of timeframes
pFrames = Int2_ManFrameInit( p, nFrames, 1 );
assert( Gia_ManRegNum(pFrames) == 0 );
// derive CNF for the timeframes
pFrames = Jf_ManDeriveCnf( pTemp = pFrames, 0 ); Gia_ManStop( pTemp );
pCnf = (Cnf_Dat_t *)pFrames->pData; pFrames->pData = NULL;
// create SAT solver
pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
if ( pSat != NULL )
{
Gia_Obj_t * pObj;
int i, nVars = sat_solver_nvars( pSat );
sat_solver_setnvars( pSat, nVars + Gia_ManPoNum(pFrames) );
// add clauses for the POs
Gia_ManForEachCo( pFrames, pObj, i )
sat_solver_add_buffer( pSat, nVars + i, pCnf->pVarNums[Gia_ObjId(pFrames, Gia_ObjFanin0(pObj))], Gia_ObjFaninC0(pObj) );
}
Cnf_DataFree( pCnf );
Gia_ManStop( pFrames );
return pSat;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Int2_ManCheckFrames( Int2_Man_t * p, int iFrame, int iObj )
{
Vec_Int_t * vMapFrame = (Vec_Int_t *)Vec_PtrEntry(p->vMapFrames, iFrame);
return Vec_IntEntry(vMapFrame, iObj);
}
static inline void Int2_ManWriteFrames( Int2_Man_t * p, int iFrame, int iObj, int iRes )
{
Vec_Int_t * vMapFrame = (Vec_Int_t *)Vec_PtrEntry(p->vMapFrames, iFrame);
assert( Vec_IntEntry(vMapFrame, iObj) == -1 );
Vec_IntWriteEntry( vMapFrame, iObj, iRes );
}
void Int2_ManCreateFrames( Int2_Man_t * p, int iFrame, Vec_Int_t * vPrefCos )
{
Gia_Obj_t * pObj;
int i, Entry, iLit;
// create storage room for unfolded IDs
for ( i = Vec_PtrSize(p->vMapFrames); i <= iFrame; i++ )
Vec_PtrPush( p->vMapFrames, Vec_IntStartFull( Gia_ManObjNum(p->pGia) ) );
assert( Vec_PtrSize(p->vMapFrames) == iFrame + 1 );
// create constant 0 node
if ( f == 0 )
{
iLit = 1;
Int2_ManWriteFrames( p, iFrame, iObj, 0 );
sat_solver_addclause( p->pGiaPref, &iLit, &iLit + 1 );
}
// start the stack
Vec_IntClear( p->vStack );
Vec_IntForEachEntry( vPrefCos, Entry, i )
{
pObj = Gia_ManCo( p->pGia, Entry );
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, Gia_ObjId(p->pGia, pObj) );
}
// construct unfolded AIG
while ( Vec_IntSize(p->vStack) > 0 )
{
int iObj = Vec_IntPop(p->vStack);
int iFrame = Vec_IntPop(p->vStack);
if ( Int2_ManCheckFrames(p, iFrame, iObj) >= 0 )
continue;
pObj = Gia_ManObj( p->pGia, iObj );
if ( Gia_ObjIsPi(p->pGia, pObj) )
Int2_ManWriteFrames( p, iFrame, iObj, Gia_ManAppendCi(p->pFrames) );
else if ( iFrame == 0 && Gia_ObjIsRo(p->pGia, iObj) )
Int2_ManWriteFrames( p, iFrame, iObj, 0 );
else if ( Gia_ObjIsRo(p->pGia, iObj) )
{
int iObjF = Gia_ObjId( p->pGia, Gia_ObjRoToRi(p->pGia, pObj) );
int iLit = Int2_ManCheckFrames( p, iFrame-1, iObjF );
if ( iLit >= 0 )
Int2_ManWriteFrames( p, iFrame, iObj, iLit );
else
{
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObj );
Vec_IntPush( p->vStack, iFrame-1 );
Vec_IntPush( p->vStack, iObjF );
}
}
else if ( Gia_ObjIsCo(pObj) )
{
int iObjF = Gia_ObjFaninId0(p->pGia, iObj) );
int iLit = Int2_ManCheckFrames( p, iFrame, iObjF );
if ( iLit >= 0 )
Int2_ManWriteFrames( p, iFrame, iObj, Abc_LitNotCond(iLit, Gia_ObjFaninC0(pObj)) );
else
{
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObj );
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObjF );
}
}
else if ( Gia_ObjIsAnd(pObj) )
{
int iObjF0 = Gia_ObjFaninId0(p->pGia, iObj) );
int iLit0 = Int2_ManCheckFrames( p, iFrame, iObjF0 );
int iObjF1 = Gia_ObjFaninId1(p->pGia, iObj) );
int iLit1 = Int2_ManCheckFrames( p, iFrame, iObjF1 );
if ( iLit0 >= 0 && iLit1 >= 0 )
{
Entry = Gia_ManObjNum(pFrames);
iLit = Gia_ManHashAnd(pFrames, iLit0, iLit1);
Int2_ManWriteFrames( p, iFrame, iObj, iLit );
if ( Entry < Gia_ManObjNum(pFrames) )
{
assert( !Abc_LitIsCompl(iLit) );
sat_solver_add_and( p->pGiaPref, Abc_Lit2Var(iLit), Abc_Lit2Var(iLit0), Abc_Lit2Var(iLit1), Abc_LitIsCompl(iLit0), Abc_LitIsCompl(iLit1), 0 );
}
}
else
{
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObj );
if ( iLit0 < 0 )
{
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObjF0 );
}
if ( iLit1 < 0 )
{
Vec_IntPush( p->vStack, iFrame );
Vec_IntPush( p->vStack, iObjF1 );
}
}
}
else assert( 0 );
}
}
int Int2_ManCheckBmc( Int2_Man_t * p, Vec_Int_t * vCube )
{
int status;
if ( vCube == NULL )
{
Gia_Obj_t * pObj;
int i, iLit;
Gia_ManForEachPo( p->pGia, pObj, i )
{
iLit = Int2_ManCheckFrames( p, 0, Gia_ObjId(p->pGia, pObj) );
if ( iLit == 0 )
continue;
if ( iLit == 1 )
return 0;
status = sat_solver_solve( p->pSatPref, &iLit, &iLit + 1, 0, 0, 0, 0 );
if ( status == l_False )
continue;
if ( status == l_True )
return 0;
return -1;
}
return 1;
}
status = sat_solver_solve( p->pSatPref, Vec_IntArray(vCube), Vec_IntArray(vCube) + Vec_IntSize(vCube), 0, 0, 0, 0 );
if ( status == l_False )
return 1;
if ( status == l_True )
return 0;
return -1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
